Add MemorySanitizer and AddressSanitizer to travis #236
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Run all the tests under MemorySanitizer + AddressSanitizer, combined with rebuilding libstd with them :)
It seems to be fast enough(nightly run with this is ~6:45m overall), so why not do it.
Example of errors it can find:
Not allocating enough memory for the context:
code change: 9dfb329...0bbe50d
result: https://travis-ci.org/github/rust-bitcoin/rust-secp256k1/jobs/722098237#L1730
Uninitialized reads (shouldn't be a problem for us):
code change: 0bbe50d...23382d6
result: https://travis-ci.org/github/rust-bitcoin/rust-secp256k1/jobs/722098767#L1756